Synthetic spinel



Patented Apr. 5 1932 UNITED STATES PATENT OFFICE EMANUEL ANCOT, FZWIGKAU, GERMANY, ASSIGHOR TO THE FIRM WIEDES CARBID- WEBK FREYUNG MITBESCHRANKTER HAFTUNG, OF FREYUNG, BAVARIA, GER- MANY SYNTHETIC SPINEL NoDrawing. Application filed January 28, 1929, Serial 110. 835,754, and inGermany August 14, 1928.

The preparation of synthetic corundum (crystallization of pure alumina}by Verneuils process is known (Vernem Comptes Rendus 1902, Vol. 135, p.791, u. it). Essentially, this process is carried out in such a mannerthat the finely powdered and intimately mixed batch-mixture is slowlypassed through the flame of an oxy-hydrogen blowpipe, the littledroplets formed being accumulated on a support and crystallizmg on thissupport upon cooling.

By the same process spinels consisting of alumina and magnesia andmoreover of red, blue, blue-green, dark green and Alexandria kinds havealready been prepared. 7

On the other hand the production'of morganite-like rose coloured spinelsis not known, morganite being the American name for rosecoloured beryl.The invention consists in the method of preparation of such syntheticspinels and in the new products obtained by this method.

The invention consists in mixing alumina (aluminum oxide) with magnesiain such proportions that a spinel base mixture results, to which for theproduction of mor anite-like rose-coloured spinels out of this ase.

mixture a suitable uantity of iron, aswell as small quantities otitanium and be Ilium an in metallic form or in the ,form of oxides or'other compounds are added, and producing fused drops by the well knownVerneuil process. By the admixture of titanium and beryllium or theircompounds the shade of colour is graduated. 1

Spinels of morglanitedike pink rose color as produced by t e methodsdescribed, are

not found in nature and are unlmown,

Example of process A spinel base mixture'is made of 500 grams ofalumina, and 100 grams of magnesia powder, and to this base mixture 10grams of iron oxide, 0.5 grams of beryllium oxide, 0.2 grams of titaniumfluoride are added,.and then fused drops are produced. The stone formedhas certained the nature of my said invention, I declare that what Iclaim is:

1. A spinel base mixture of alumina and magnesia of about 600 parts withapproximately 10 parts of an ron compound, 0.5 parts of a berylliumoxide and 0.2 parts of titanium fluoride, all parts being by weight.

2. A s nthetic spinel having a pink rose color an made from acomposition comprising alumina and magnesia about 600 parts, withapproximately 10 parts of an iron oxide, 0.5 parts of beryllium oxideand 0.2 parts 7 of titanium fluoride, all parts being by weight.

3. A spinel base mixture containingthe following compounds in about thespecified ratio, alumina 500 parts, magnesia 100 parts, iron oxide 10arts, beryllium oxide 0.5 arts, and titanium uoride 0.2 parts, all partseing by weight. 4. A s thetic spinel having a pink rose coloran madefrom a composition comprising the following ingredients in about theratio stated, alumina 100 parts, ma esia 100 parts, iron oxide 10 parts,berylhum oxide 0.5 parts, and titanium fluoride 0.2 parts, all partsbeing by weight.

In testimony whereof I have hereunto set my hand.

EMANUEL ANCOT.

a beautiful rose colour, a high refractive index, a clear transparency,and a bright lustre.

:3 now particularly described and as-

